Wow how easily you have explained, flyingboxcar 

You guys are rocking this forum.

I, going to become a Surgeon sooner than expected.

Jai Hind
All the Best
Akshay

Quote from: augustinev on February 18, 2011, 07:01:06 PM
what i am talking about it is engine cut gliding down, i am having to push fwd, indicating CP is on or slightly behind CG.

Could be the motor has excessive downthrust needing up trim for level flight at higher throttle settings. This would then require down trim with the motor cut or at idle.

good point, on my way to check it on the field

Hi Augustinev/flyboxer,

finally I've started building the YAK 54  bought from Pravin.

Presently received the below consigment from HKB (after 25 days)

TR 35-36B 1300kv Brushless Outrunner (Eq:2814)
BATTERY Turnigy 2200mAh 3S 30C Lipo Pack
TURNIGY TRUST 45A SBEC Brushless Speed Contr
APC style propeller 10x5-E
HXT900 9g / 1.6kg / .12sec Micro Servo -Still waiting for next consigment to come from HK along with batt .charger (consgment to arrive next or so).

Presently ,I don't have an 9in 9 inch extension lines  for rudder & stab,used 4 extension line ,& also no y connector for alerons but need these ,will check whether rc damaka has it ?

1) To start with : completed all servoes attachment drilling of small holes & fixing of 2 servoes.
(borrowed by my friend)

"Servo mount for elevator and rudder requires reinforcement, used CA and Soda (A little) " can you explain how was this done ?

2) Glued the elevator & rudder.with respect the wing tip to elevator with equal distance & also check that the wing  & stab are parallel to each other.

3) Wing joiner pipe (Surprise was 1mm lose was falling out of fuselage if tilted side ways,put a tape on it so it stays firm on both wings & the fuselage.

4) for engine mount ,wanted to mount the motor in front of the mount & not inside as I want to use the thread accessories shaft provided by the mfg ,if I mount the motor inside the mount then I have to use the thin shaft,what the correct way,new to electric.

" PLEASE mount motor onto the mount plate before you make the mount (Do not follow the book)".

5) Thanks to your son scale ,for the idea of installing battery is just great.Also the rubber trick for landing gears is well noted.

6) To keep the lateral balance, i marked all positions including esc and the battery position.
This mean to keep esc /battery in centerline of fuselage.

Hi flyingboxcar,

7) CG -mentioned in  manual -75mm from fuselage,will check on this after turning the plane up side down.

  Has the tail wheel been stuck in the rudder -very soft ,any better suggestion

tail wheel fix can be tricky, watch out


9) will reduce throws to 20 -22%

Do I need to adjust the trust line i.e two deg down and 2 deg right ,could I but a washer on upper bolts & on the left.

how did you install the ESC & RX ? Did you velcro them .

Any other suggestion is still welcomed.

regards
peter

Peter
A lot of water has flown under the bridge after that. let me cover a few more developments

(a) Keep the CG to 60 mm and not 75 mm, 75 mm is little too tail heavy, and it is also not the max thickness point, max thickness is at about 60 mm. keep it there, in spite of the forward batt, i had to add 32 gms of nose wt to adjust the CG, put it just under the cowling at six of clock position

(b) if you have silicon cloth piece shred it stick it with quickfix, where you are going to mount he servo sprinkle some baking soda and pour super glue, (A trick taught by Israelis) be sure wear a mask, if fumes enters your nostrils you will feel giddy, soda and super glue (Fevi Kwik) reacts and gives out pungent odour, , the reinforcement becomes like a rock.

(c) epoxy and alcohol (Not the drinking kind) mix it and brush it in all joints to reinforce it, leave it for 48 hrs, joints are quite flimsy and glue used is inadequate. for inaccessible places like the fuse and the emphenage use syringe

(d) Motor mount is SH@#t, see youtube there are a lot of options available for holding the motor mount properly, use the one that suits you, i fixed four nuts and bolts to reinforce it.

(e) do not run the motor at full throttle on ground, since the model is not getting pulled on ground max load comes on the motor mount, it can even fly off and you may look for it in the bushes of airoli and never find it (JPUL)

(f) be sure to keep the throw to bare min for maiden

(g) 'Y' connector is not required, if you have a good radio, you can convert it into a flaperons for a real low speed flight and landing, and you can also configure it for air brakes and of course snap roll, all of it it does decently well

(h) Given enough motor power it can even be hand launched.

(i) Double sided tape on either side of the fuse wall (As i am sharing the ESC)

That's all i can remember now

All the best for your maiden

maiden of my extra 330 changed after reading ur post,some more work to finish in the area of reinforcement

Santhosh

all the best, your Extra is aerodynamically a better machine

Hi Augustinev,

Honestly -thanks for your reply-Sorry for the late reply phones were dead for 2 days,come late from work.

Yes I was finding the CG between 60 to 65 mm after placing the battery on the fuselage with 2 rubber band & moving it back & front. since I have  heavy esc & battery ,motor 3536 1300kv that should do the trick.

will check some videos on you tube boss for motor mounting but I I'm still not clear on the mount & had to stop my building reason i want the motor to e mounted in from of the wooden mount & not inside it as shown in the catalog-will that play a Major role of change in the CG.

It also came to my mind to put double sided tape on the ESC & Also the battery with a tie rap.

Will keep you posted.

regards
peter